Quoted from: Gilhespy, Sarah L., Steven Anthony, Laura Cardenas, David Chadwick, Agustin del Prado, Changsheng Li, Thomas Misselbrook et al. "First 20 years of DNDC (DeNitrification DeComposition): model evolution." Ecological modelling 292 (2014): 51-62. https://doi.org/10.1016/j.ecolmodel.2014.09.004 

A regional framework for calculating N2O emissions from intensive agricultural land (croplands and temporary grasslands) was developed by integration of the DNDC model (version 8.3P) with regional data on soil and climate, land use and farm practices for Belgium (Beheydt, 2006). The regional predictions of N2O emissions were based on regression equations developed separately for cropland and grassland that scaled the DNDC model outputs. The regression equations were corrected for the differences between simulated and measured emissions at 22 long-term field monitoring sites in Belgium (Beheydt et al., 2007). To represent uncertainty in model inputs, the framework calculated emissions with high and low estimates of soil C content.